Let me break it to you gently. A .223 is no match for an RPG.
How about 50 .223’s and 25 7.62’s? Would it be long before you could pick up RPG’s off the ground?
US armed forces personnel = about 600,000
US armed civilians = about 90,000,000
An estimated 15,000 armed 'insurgents' embroiled the superior forces of the US military in Iraq for nearly a decade. Our forces retired from that war without achieving a confirmed victory. The same thing occurred in Vietnam, forty years ago.
Even if nine out of ten armed Americans were to lay down or give up their arms, the US military would conceivably be faced with quelling a force of 9,000,000 angry and determined people who would be fighting for their country, their property, their rights, their families, and everything that makes life dear and precious to them.
That is without question, the largest, most determined armed force on the planet.
There would also be mass defections, refusal of orders, and mutiny within the ranks of the federals, which would thoroughly decimate the their ability to wage war upon their own citizens.
Don't think they haven't war gamed this scenario out long ago, and found that they cannot defeat us.